Quozl had packaged Xtank 1.3f for Debian GNU/Linux 3.0 (Woody) back in 2001, and for 3.1 (Sarge) in 2004, modified for 800x600 monitors. Now contributions are encouraged against the source repository ... there are a few opportunities to fix things ... the threading, the robot programs.
The 800x600 style 2004 binaries: add the following line to your /etc/apt/sources.list file:
| deb http://quozl.linux.org.au/xtank ./ |
... and then
| apt-get install xtank-north |